Liquid-rheostat.



PATENTED OCT. 9, 1906.

G. W. CRAVENS. LIQUID RHEOSTAT.

APyLIoATloN FILED 061221. 1905.

l' -llllllll INVENTOR:

wam 5555:

UNITED STATES LlQUlD-RHEOSTAT.

Specification of Letters Patent.

Patented. Oct, Q, 1906.

Application tiled Urheber 21.1905. Serial No. 283,?31,

Be it known that l, tizonoia Figurine, :L citizen of the United States, residing,r sit. Schenectady. count)r of Schenectady, State of New York, have invented certain new and useful improvements in. Liquidliheostats, of which the following is a speciliezition.

This invention relotes to liqnidlrheostfits for controlling electric motors, and has fortita` object the provision of a device of this Character which is adapted to si variety of uses in connection with hoth the starting and runningof motors and whieh-will he cheap oll construet1on,siinple of operation, sind it the sinne time thoroughly ofiicient, safe, :ind durable.

My invention relates moro specifically to water-rlieosmts for use in connection wit i alterimtiiig-cnrrent motors, and is well adapted for use in connection with polyphone induen tion-motors, although it is capable of eneral use. ciiillv where heavy currents are to he regulated or -where a. heavy loud from a generator is to he absorbed, as in a ease where the Imi-` ehines are heini@r tested. Liquid-rheostats as hnreinhefore designed for alternating-sument; servire-ha ve. provided simply for thoregulotion or" the resistance of the System esa. whole und no provision is made for varying the load in each leg of the system independently of tho others. Y

ln carrying out. my invention I provide a liquid-rheostut in which the resistance in the entire system is varied by a. single operation,

:rnd in addition to this l. provide means for 'varying' :i resistimeo in any one leg of the system without interfering with the resistance in the other leg` I also .roride a. rheostnt in which thi` r-.onduf'ting e entente are made to# gering or ono-shaped. the advantages of which arrangement will he olwious to one skilled in the irrt.

My inventiontherefore consists in the fea.- tures of construction and the :irranwement and combination of elements.hereinfiter setforth, and part-wuhirljf pointed out. in the elnims annexed to and forniting si. part.. of this op )lim-ition. ,l

.liT the. drewinvs, Figure 1- is e. sectional View ol" o liqilidiheosmt embodying my nvention. Fig. 2 is a plan View of the same. Fig. 3 if: 2. detail showing the construction of thelsmiepartitwns. Fig. 4 showsthe Yoke i'or no;ineetiingrthesections of the hood, and Fig. shows the. terminal connections.

Water-rheostats are ver)v use'lu esipe-A lleff-Wriny; io [he drawings, l() is .-1 rt-r'eplsicle or mnh, ln'eleruhly eirt-nhtr in Simply. lor containing tie witter und nmj.' he ol' any snitnhle material. l have nhowr this tank as inode ot" wood. :einerin the partit-:dur type' of rlnfostiit illustrated it is ementiul that the tank itsell he ol' insulating nmterinl. The tank is divided into three 'olnpurtinents h v inea-ns ofthe partitions ll. 12, und lli. This arrangement of eonrse muy also he varied to suit the eonditions und `kind ol' enrrent to he regulated. The derive :is shown is intended for three-phase f'iirrent. und therefore three 19. A handle 2U is provided for euch screw,

so that; hy turningr the handle eneh element may he adjusted in its't'oinpm'lnient. Threi` correspon inglvlmped elements 2l, 22. und 23 are provided. one` for esi-eh ionilmrtinent. These elements nre shaped in the l'orin ol' u hood and connected nt the top hy means ot' U-shafied straps 24. ThnxY n re :lino provided with hinged portions 25. whit-h rml upon tln flanges of the sliding ele|ntnt when thil upper element is lowered into tontm-t with the lower one. The flange ol' the hood is mit #Hay at 2li so :is to [it over thii hnl in the ower flange. The three elelnenh` nre ronneotied together h f :nehm oll u triangular v)mko-2?', which is provided with :i Y-shuned casting 23h11 atitaehinent with :in udjneting- Cable 29. By means ol' thi mhh the three elements muy he moved up mid down in the vessel together, so its to vary the reistnnve between eaeh pair of elementv in :i romlmrtnient.

.iCaeh element. i4, l5. ind iti loi-iml un nlm trie terminal, connection with whit-h is inude Shown in Fig. 5. The eurrent passes front the cronductingwire- 3() to the element thronvh the bearing 3l und serew 18. The partitions forming the eonipiirtments extend nearly to the top 'of the tank sind nro eut. away. an at 32, to allow the witter to circulate. from one compartment to the other.

The operation of m3.' derive will he clearly i each palr.

gather, so as to form them into a common tion -to this particular construction, since it is understood from the foregoing description. By lowering and raising the yoke 27 by means of the cable 29 the conical elements are caused to approach and recede from each other, so as to vary the resistance between them when the tank is filled with water. When the movable elements are loweredinto the. tank and it is desired to vary the load in any leg of the system, this may be done by means of the handle 20.

In the arrangement shown the elements 2l, 22, and 23 are electrically connected toneutral. I do not, however, limit my invenglear to one skilled in the art that these elements need not be electrically connected, as it is notl essential-that a common neutral be formed. It should be .further understood that I do not limit In inventiontofan-insulating-tank nor to t 1e particu-lar'farrangement of elements or mode of operation except as it is limited by the claims annexedlhereto.

What I claim as new, and desire to secure by Letters Patentof the United-States, is

1. A liquid-rheostat comprising va plurality of conducting elements, a common neutral element, and means for varying the resistance between one of said conducting elements and the common neutral independently of the others.

2. liquid-rheostat comprising a plurality of conducting elements,a common neutral element, means for vai-yin the resistance be tween the common neutraizand all ofthe conducting elements simultaneously, and means for varying the resistance between the common neutral and one of said elements inde` pendently.

3. A liquid-rheostat comprising a receptacle for the liquid, a plurality of pairs of tapering conducting elements therein, and means for independently yadjusting the elements of 4. A liquid-rheostat comprising a plurality of tapering conducting elements, a similarlyshaped common neutral conductor, and means for varying the distance between the conducting elements and said common neutral. i

5. liquid-rlieostat comprising a plurality of tapering conducting elements, a similarlyshaped common -neutral conductor, and means for varying the distance between one of the conductors and the common neutral independently of the others. v

6. A liquid-rheostat comprising a plurality of tapering conducting elements,'a similarlyshaped common neutral element,4 means' for varying the distancev between the tapering' elements andthe common neutral simultaneously, and means for varying the distance between Vone of said elements and the common nutral independently of the others.

7. In a water-rheostat, the combination with a receptacle'for the water, of a lurality of conducting elements therein a justable with respect to each other, and a conducting element common to said adjustable elements and movable to and from the same.

8. In a water-rheostat, the combination with a receptacle for the water, of a plurality of conducting elements therein, a common neutral conductor, and means for varyin the resistance between any one of said con" ucting elementsand the common neutral.

9. In a water-rheostat, the combination with a receptacle for the water, of a plurality of pairs of conducting elements therein, and

means for varying the arrangement of the ele- 8o ments of apair independent ofthe others.

`10. In a water-rheostat, t e combination with a plurality of compartments for the li 4uid, Aif a pair of eonductinA elements in eac compartment, and means or varying the arrangement' of the elements of a pair independe tly ofthe others.

, l1. n a water-rheostat, the combination with a pluralit f of compartments for the liquid, of a p'air o2 t in each compartment, and means for varying the arrangement of the elements of a pair independently of the others 12. In a liquid-rheostat, the combination of p'ars of conducting elements therein,- means for varying the arrangement of the yelements of all of the pairs simultlai'neously` and means for varying the arrangement o the elements of each pairV `independently of the others.

I3. In a' water-rheostat, the combination with a receptacle for the water, of a lurality of taperiv conducting elements t crein, a similarly-s aped common neutral element, and means for varying the distance between apering conducting elements 9o Awith a receptacle for the liquid, of aplurality ICIS said conimon'neutral and any one of the conductin elements independently of the others.

14. n a water-rheostat, the combination` with a receptacle for the water provided with compartments, of a conducting element in each compartment. a common neutral element movable in said compartments .to and from said conducting elelnents, and means for varyingthe distance between said neutral element and any one of said conducting elements independently of the others.

15. A li uid-rheostat com risin a receptacle for t e liquid, a plura ity o taperin elements therein movable in a horizonta plane, and a corres ondingly-sha ed memer common tosai yelements an movable toward and from the same in a vertical plane.

In Witness whereof I have hereunto set my hand this 18th day of October, 1905.

GEORGE WV. GRAY ENS. 

